US20130163284A1 - Lateral planar light emitting module - Google Patents
Lateral planar light emitting module Download PDFInfo
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- US20130163284A1 US20130163284A1 US13/444,920 US201213444920A US2013163284A1 US 20130163284 A1 US20130163284 A1 US 20130163284A1 US 201213444920 A US201213444920 A US 201213444920A US 2013163284 A1 US2013163284 A1 US 2013163284A1
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- light emitting
- light
- base plate
- rectangular base
- lateral planar
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0066—Reflectors for light sources specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2105/00—Planar light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present invention relates to the area of planar light emitting modules, in particularly to a lateral planar light emitting module capable of producing a light emitting effect for a light source of a light emitting diode with uniform light intensity on a light exit surface without requiring a light guide plate structure.
- Light emitting diode has the features of long life, low power consumption, and high brightness, and thus it is used extensively and plays an important role in different areas including illumination, warning or display, and becomes a first choice of the light emitting source.
- the light emitting diode has the property of a high directivity, which limits the applicability of the light emitting source in various different applications, and requires an overall structural improvement of the light emitting source.
- a full-range illumination device is provided to meet the illumination requirements, or a light guide plate is provided to guide a light source of a backlight module of a display and change the light exit path to emit uniform light.
- the backlight module is used as an example only.
- the light emitting diode is used as the light emitting source to achieve the power-saving, low-pollution and high-color effects and the light and thin design
- the light guide plate is still a necessary component, particularly for a lateral backlight module. Therefore, the light guide plate plays an important role of a light guide medium while absorbing lots of light energies.
- the display requires an increasing larger size, the cost and weight of the display will be increased, which is a disadvantageous manufacturing condition for terminal products.
- the light guide plate for large displays requires a thinner structure, which causes a more difficult manufacturing process, and a higher manufacturing cost. Therefore, it is a subject for related manufacturers to omit the light guide plate or substituting the light guide plate by another structure while maintaining a uniform planar light emitting effect.
- a lateral planar light emitting module comprising a rectangular base plate and a plurality of light emitting diodes, and the rectangular base plate has a diagonal falling within a range of 5 ⁇ 100 cm, and the light emitting diodes are designed with an array arrangement and installed on both lateral opposite sides of the rectangular base plate respectively, such that a light source emitted from the light emitting diodes can be directly projected, or reflected from a reflective micro-structure of the rectangular base plate, and then a light emitting effect with a uniform light intensity is achieved on a light exit surface, wherein the light exit surface opposite to a light projection area with a different intensity produced by the same light emitting diode has an optical path with a different distance and used for substituting a light guide plate used in a conventional backlight module or planar light emitting source to enhance the brightness of an optical film structure, lower the manufacturing cost, and
- the present invention provides a lateral planar light emitting module, comprising a rectangular base plate and a plurality of light emitting diodes, and the rectangular base plate having a diagonal falling within a range of 5 ⁇ 100 cm, and light emitting diodes being designed with an array arrangement and installed on both opposite sides of the rectangular base plate respectively, so that a light source emitted from the light emitting diodes is projected directly or reflected from the rectangular base plate, and then light emitting effect with a uniform light intensity distribution at a light exit surface is achieved
- the lateral planar light emitting module is characterized in that a strong light emitting area, a secondary light emitting area, a weak light emitting area and a slightly light emitting area are formed sequentially at normal included angles between each of the light emitting diodes and an environmental medium from 0° to 90°, and the rectangular base plate includes at least one reflective micro-structure formed thereon, and when the light source emitted from each of the light emitting diodes has not passed
- the normal included angle between any one optical path in the strong light emitting area and the environmental medium is equal to ⁇ 1
- the normal included angle between any one optical path in the secondary light emitting area and the environmental medium is equal to ⁇ 2
- the normal included angle between any one optical path in the weak light emitting area is equal to ⁇ 3
- the normal included angle between any one optical path in the slightly light emitting area is equal to ⁇ 4
- cos ⁇ 1 /R 1 2 ⁇ cos ⁇ 2 /R 2 2 ⁇ cos ⁇ 3 /R 3 2 ⁇ cos ⁇ 4 /R 4 2 cos ⁇ 1 /R 1 2 ⁇ cos ⁇ 2 /R 2 2 ⁇ cos ⁇ 3 /R 3 2 ⁇ cos ⁇ 4 /R 4 2 .
- the angle ⁇ 1 falls within a range of 0° ⁇ 1 ⁇ 30°
- the angle ⁇ 2 falls within a range of 30° ⁇ 2 ⁇ 45°
- the angle ⁇ 3 falls within a range of 45° ⁇ 3 ⁇ 60 °
- the angle ⁇ 4 falls within a range of 60° ⁇ 4 ⁇ 90°.
- the distance between the rectangular base plate and the light exit surface falls within a range of 0.1 cm ⁇ 5 cm.
- the reflective micro-structure includes two primary inclined plate structures, and the light emitting diodes disposed opposite to both sides of the rectangular base plate are installed at the middle positions of the rectangular base plate.
- the lateral planar light emitting module further comprises at least one optical lens installed at a light output position of the light emitting diode.
- the light emitting diodes are installed at different angles towards the rectangular base plate.
- a lateral planar light emitting module having a rectangular base plate and a plurality of light emitting diodes is provided, and the rectangular base plate has a diagonal falling within a range of 5 ⁇ 100 cm, and the light emitting diodes are designed with an array arrangement and installed on both opposite sides of the rectangular base plate respectively, such that a light source emitted from the light emitting diodes can be directly projected, or reflected from a reflective micro-structure of the rectangular base plate, and then a light emitting effect with a uniform light intensity is achieved on a light exit surface, wherein the light exit surface opposite to a light projection area with a different intensity produced by the same light emitting diode has an optical path with a different distance and used for substituting a light guide plate used in a conventional backlight module or planar light emitting source to enhance the brightness of an optical film structure, lower the manufacturing cost, and improve the light emitting efficiency effectively.
- FIG. 1A is a first schematic view, showing a radiation field design theory of a light emitting diode of a lateral planar light emitting module in accordance with the present invention
- FIG. 1B is a second schematic view, showing a radiation field design theory of a light emitting diode of a lateral planar light emitting module in accordance with the present invention
- FIG. 1C is a third schematic view, showing a radiation field design theory of a light emitting diode of a lateral planar light emitting module in accordance with the present invention
- FIG. 2A is a first bottom view of a lateral planar light emitting module in accordance with the present invention.
- FIG. 2B is a second bottom view of a lateral planar light emitting module in accordance with the present invention.
- FIG. 3 is a first cross-sectional view of a lateral planar light emitting module in accordance with the present invention.
- FIG. 4 is a second cross-sectional view of a lateral planar light emitting module in accordance with the present invention.
- FIG. 5 is a cross-sectional view of a lateral planar light emitting module with an optical lens in accordance with the present invention.
- FIG. 6 is a cross-sectional view of a light emitting diode of a lateral planar light emitting module projecting lights at different angles towards a rectangular base plate in accordance with the present invention.
- the lateral planar light emitting module 1 comprises a rectangular base plate 10 and a plurality of light emitting diodes 12 , wherein the rectangular base plate 10 has a diagonal falling within a range of 5 ⁇ 100 cm, and the light emitting diodes 12 are designed with an array arrangement and installed on both opposite sides of the rectangular base plate 10 respectively, such that a light source emitted from the light emitting diodes 12 is projected directly or reflected from at least one reflective micro-structure 101 installed on the rectangular base plate 10 to achieve a light emitting effect with a uniform light intensity on a light exit surface 14 .
- the lateral planar light emitting module 1 of the present invention provides an important design is required for guiding the light source of the light emitting diodes 12 while considering the light distribution with a uniform light intensity, such that each of the light emitting diodes 12 has its own light distribution area with a different intensity to corresponding different optical paths.
- each of the light emitting diodes 12 is comprised of a semiconductor structure 1202 having a dot light source 1201 .
- the semiconductor structure 1202 is n s
- the environmental medium index of refraction is Il e
- the interface distance from the dot light source 1201 to the semiconductor structure 1202 and the environmental medium 2 is very short (as shown in FIG.
- a normal included angle between the light source path of the light emitting diodes 12 and the environmental medium 2 is equal to ⁇
- the angle of refraction after the light is refracted from the interface is equal to ⁇ .
- a strong light emitting area 121 a secondary light emitting area 122 , a weak light emitting area 123 , and a slightly light emitting area 124 are formed sequentially in the light intensity distribution area of each of the light emitting diodes 12 and at a normal included angle between each of the light emitting diodes 12 and an environmental medium 2 ranging from 0° to 90°.
- ⁇ 1 falls within a range of 0° ⁇ 1 ⁇ 30°
- ⁇ 2 falls within a range of 30° ⁇ 2 ⁇ 45°
- ⁇ 3 falls within a range of 45° ⁇ 3 ⁇ 60°
- ⁇ 4 falls within a range of 60° ⁇ 4 ⁇ 90°.
- the maximum light intensity occurs at a normal included angle between each of the light emitting diodes 12 and an environmental medium 2 equal to 0°; ( ⁇ square root over ( ) ⁇ 3)/2 of the maximum light intensity occurs at the included angle of 30°; ( ⁇ square root over ( ) ⁇ 2)/2 of the maximum light intensity occurs at the included angle of 45°; 1 ⁇ 2 of the maximum light intensity occurs at the normal included angle of 60° 1 ⁇ 2; and the intensity approaches zero at the normal included angle of 90°.
- a first light output point p 1 emitted from the strong light emitting area onto the light exit surface, a second light output point p 2 emitted from the secondary light emitting area onto the light exit surface, a third light output point p 3 emitted from the weak light emitting area onto the light exit surface, and a fourth light output point p 4 emitted from the slightly light emitting area onto the light exit surface have the same distance R p1 , R p2 R p3 and R p4 from the light emitting diode 12 of the same two-dimensional space, then R p1 >R 2 >R p3 >R p4 .
- the relation cos ⁇ 1 /R 1 2 ⁇ cos ⁇ 2 /R 2 2 ⁇ cos ⁇ 3 /R 3 2 ⁇ cos ⁇ 4 /R 4 2 is adjusted to obtain the best light emitting effect.
- the light emitting diodes 12 as shown in FIG. 2B can be installed on two opposite long sides of the rectangular base plate 10 respectively, and the structural design of the reflective micro-structures 101 can be designed as larger or smaller orderly arranged protruding structures according to the distance from the light emitting diodes 12 .
- the reflective micro-structure 101 includes two primary inclined plate structures 1011 , and the two primary inclined plate structures 1011 are light emitting diodes 12 disposed opposite to both sides of the rectangular base plate 10 respectively and installed at the middle positions of the rectangular base plate 10 .
- the height and inclination for installing the two primary inclined plate structures 1011 is determined by the distance from the light emitting diodes 12 and the aforementioned relation.
- the two primary inclined plate structures 1011 are light emitting diodes 12 arranged in an array on one of the corresponding sides only. Therefore, the light source path can be controlled at the reflection position of the light exit surface 14 effectively. Since the distances from the rectangular base plate 10 and the light exit surface 14 are different, the height and inclination of the two primary inclined plate structures 1011 will be determined by adjusting the relation of cos ⁇ 1 /R 1 2 ⁇ cos ⁇ 2 /R 2 2 ⁇ cos ⁇ 3 /R 3 2 ⁇ cos ⁇ 4 /R 4 2 . with reference to FIG.
- the optical path of each of the light emitting diodes 12 can be adjusted flexibly at the position of the light exit surface 14 , and adjacent sides of the two primary inclined plate structures 1011 have two secondary inclined plate structures 1012 respectively for fixing each light emitting area with a fixed output light angle on the light exit surface 14 to form different optical paths, so as to adjust the magnitude and position of the light intensity of the output light.
- the two primary inclined plate structures 1011 and the two secondary inclined plate structures 1012 can be designed with a non-flat plate surface for changing the angle of the optical path significantly and effectively without increasing the optical path too much, so as to maintain the performance of the light intensity.
- the structural design of the foregoing preferred embodiment adjusts the light intensity of the output light when the output position and the length of the optical length in the light emitting area of the light emitting diodes 12 are fixed through the reflective micro-structure 101 .
- an optical lens 16 is provided for changing the range of the light emitting area of the light emitting diodes 12 directly, and two adjustment factors are used for adjusting the position and the intensity of the output light at the light exit surface 14 .
- the optical lens 16 can reflect all lights projected onto the reflective micro-structure 101 for the areas with the light intensity grater than half of the maximum intensity, so that a larger range of the light intensity can be used effectively.
- the light emitting diodes 12 of the present invention are arranged in an array, so that the radiation field of each of the light emitting diodes 12 at the light exit surface 14 may have a superimposition effect. Therefore, the edges (such as the frame of the display) of the rectangular base plate 10 have a less superimposition effect than the central area of the rectangular base plate 10 .
- the light emitting diodes 12 can be installed at a different angle with respect to the rectangular base plate 10 , such that the light emitting areas of the light emitting diodes 12 can be used effectively.
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Abstract
A lateral planar light emitting module has a rectangular base plate and a plurality of light emitting diodes, and the light emitting diodes are designed with an array arrangement and installed on both opposite sides of the rectangular base plate respectively, so that a light exit surface opposite to a light projection area with a different intensity produced by the same light emitting diode has an optical path with a different distance after a light source emitted from the light emitting diodes is projected directly or reflected from a reflective micro-structure of the rectangular base plate, and a light emitting effect with a uniform light intensity distribution is achieved on the light exit surface to lower the manufacturing cost and improve the light emitting efficiency effectively.
Description
- This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 100148865 filed in Taiwan, R.O.C. on Dec. 27, 2011, the entire contents of which are hereby incorporated by reference.
- 1. Field of the Invention
- The present invention relates to the area of planar light emitting modules, in particularly to a lateral planar light emitting module capable of producing a light emitting effect for a light source of a light emitting diode with uniform light intensity on a light exit surface without requiring a light guide plate structure.
- 2. Description of the Related Art
- Light emitting diode has the features of long life, low power consumption, and high brightness, and thus it is used extensively and plays an important role in different areas including illumination, warning or display, and becomes a first choice of the light emitting source. On the other hand, the light emitting diode has the property of a high directivity, which limits the applicability of the light emitting source in various different applications, and requires an overall structural improvement of the light emitting source. For example, a full-range illumination device is provided to meet the illumination requirements, or a light guide plate is provided to guide a light source of a backlight module of a display and change the light exit path to emit uniform light.
- However, the backlight module is used as an example only. Although the light emitting diode is used as the light emitting source to achieve the power-saving, low-pollution and high-color effects and the light and thin design, yet the light guide plate is still a necessary component, particularly for a lateral backlight module. Therefore, the light guide plate plays an important role of a light guide medium while absorbing lots of light energies. As the display requires an increasing larger size, the cost and weight of the display will be increased, which is a disadvantageous manufacturing condition for terminal products. On the other hand, the light guide plate for large displays requires a thinner structure, which causes a more difficult manufacturing process, and a higher manufacturing cost. Therefore, it is a subject for related manufacturers to omit the light guide plate or substituting the light guide plate by another structure while maintaining a uniform planar light emitting effect.
- In view of the description above, the inventor of the present invention based on years of experience in the related industry to conduct extensive researches and experiments, and finally provided a lateral planar light emitting module, comprising a rectangular base plate and a plurality of light emitting diodes, and the rectangular base plate has a diagonal falling within a range of 5˜100 cm, and the light emitting diodes are designed with an array arrangement and installed on both lateral opposite sides of the rectangular base plate respectively, such that a light source emitted from the light emitting diodes can be directly projected, or reflected from a reflective micro-structure of the rectangular base plate, and then a light emitting effect with a uniform light intensity is achieved on a light exit surface, wherein the light exit surface opposite to a light projection area with a different intensity produced by the same light emitting diode has an optical path with a different distance and used for substituting a light guide plate used in a conventional backlight module or planar light emitting source to enhance the brightness of an optical film structure, lower the manufacturing cost, and improve the light emitting efficiency effectively.
- Therefore, it is a primary objective of the present invention to provide a light emitting effect for a light source of a light emitting diode with uniform light intensity on a light exit surface without requiring a light guide plate structure, so that the light source can be applied effectively in a backlight module of a display or in other planar illumination equipments.
- To achieve the foregoing objective, the present invention provides a lateral planar light emitting module, comprising a rectangular base plate and a plurality of light emitting diodes, and the rectangular base plate having a diagonal falling within a range of 5˜100 cm, and light emitting diodes being designed with an array arrangement and installed on both opposite sides of the rectangular base plate respectively, so that a light source emitted from the light emitting diodes is projected directly or reflected from the rectangular base plate, and then light emitting effect with a uniform light intensity distribution at a light exit surface is achieved, and the lateral planar light emitting module is characterized in that a strong light emitting area, a secondary light emitting area, a weak light emitting area and a slightly light emitting area are formed sequentially at normal included angles between each of the light emitting diodes and an environmental medium from 0° to 90°, and the rectangular base plate includes at least one reflective micro-structure formed thereon, and when the light source emitted from each of the light emitting diodes has not passed through a reflection path or reflected from the rectangular base plate of the reflective micro-structure, a first light output point p1 emitted from the strong light emitting area onto the light exit surface, a second light output point p2 emitted from the secondary light emitting area onto the light exit surface, a third light output point p3 emitted from the weak light emitting area onto the light exit surface, and a fourth light output point p4 emitted from the slightly light emitting area onto the light exit surface have a distance of Rp1, Rp2, Rp3 and Rp4 from the light emitting diode of the same two-dimensional space respectively, and Rp1>Rp2>Rp3>Rp4.
- Wherein, if the normal included angle between any one optical path in the strong light emitting area and the environmental medium is equal to θ1, the normal included angle between any one optical path in the secondary light emitting area and the environmental medium is equal to θ2, the normal included angle between any one optical path in the weak light emitting area is equal to θ3 and the normal included angle between any one optical path in the slightly light emitting area is equal to θ4, then cos θ1/R1 2≈cos θ2/R2 2≈cos θ3/R3 2≈cos θ4/R4 2.
- In a preferred embodiment, the angle θ1 falls within a range of 0°<θ1≦30°, the angle θ2 falls within a range of 30°<θ2≦45°, the angle θ3 falls within a range of 45°<θ3≦60° and the angle θ4 falls within a range of 60°<θ4≦90°.
- In another preferred embodiment, the distance between the rectangular base plate and the light exit surface falls within a range of 0.1 cm˜5 cm.
- In another preferred embodiment, the reflective micro-structure includes two primary inclined plate structures, and the light emitting diodes disposed opposite to both sides of the rectangular base plate are installed at the middle positions of the rectangular base plate.
- In another preferred embodiment, the lateral planar light emitting module further comprises at least one optical lens installed at a light output position of the light emitting diode.
- In another preferred embodiment, the light emitting diodes are installed at different angles towards the rectangular base plate.
- The effects of the present invention reside on that a lateral planar light emitting module having a rectangular base plate and a plurality of light emitting diodes is provided, and the rectangular base plate has a diagonal falling within a range of 5˜100 cm, and the light emitting diodes are designed with an array arrangement and installed on both opposite sides of the rectangular base plate respectively, such that a light source emitted from the light emitting diodes can be directly projected, or reflected from a reflective micro-structure of the rectangular base plate, and then a light emitting effect with a uniform light intensity is achieved on a light exit surface, wherein the light exit surface opposite to a light projection area with a different intensity produced by the same light emitting diode has an optical path with a different distance and used for substituting a light guide plate used in a conventional backlight module or planar light emitting source to enhance the brightness of an optical film structure, lower the manufacturing cost, and improve the light emitting efficiency effectively.
-
FIG. 1A is a first schematic view, showing a radiation field design theory of a light emitting diode of a lateral planar light emitting module in accordance with the present invention; -
FIG. 1B is a second schematic view, showing a radiation field design theory of a light emitting diode of a lateral planar light emitting module in accordance with the present invention; -
FIG. 1C is a third schematic view, showing a radiation field design theory of a light emitting diode of a lateral planar light emitting module in accordance with the present invention; -
FIG. 2A is a first bottom view of a lateral planar light emitting module in accordance with the present invention; -
FIG. 2B is a second bottom view of a lateral planar light emitting module in accordance with the present invention; -
FIG. 3 is a first cross-sectional view of a lateral planar light emitting module in accordance with the present invention; -
FIG. 4 is a second cross-sectional view of a lateral planar light emitting module in accordance with the present invention; -
FIG. 5 is a cross-sectional view of a lateral planar light emitting module with an optical lens in accordance with the present invention; and -
FIG. 6 is a cross-sectional view of a light emitting diode of a lateral planar light emitting module projecting lights at different angles towards a rectangular base plate in accordance with the present invention. - The technical content of the present invention will become apparent by the detailed description of the following embodiments and the illustration of related drawings as follows.
- With reference to
FIGS. 1A , 1B, 1C, 2A, 2B, and 3 for the first, second and third schematic views showing a radiation field design theory of a light emitting diode of a lateral planar light emitting module in accordance with the present invention and the first, second and third bottom views of the lateral planar light emitting module of the present invention respectively, the lateral planarlight emitting module 1 comprises arectangular base plate 10 and a plurality oflight emitting diodes 12, wherein therectangular base plate 10 has a diagonal falling within a range of 5˜100 cm, and thelight emitting diodes 12 are designed with an array arrangement and installed on both opposite sides of therectangular base plate 10 respectively, such that a light source emitted from thelight emitting diodes 12 is projected directly or reflected from at least onereflective micro-structure 101 installed on therectangular base plate 10 to achieve a light emitting effect with a uniform light intensity on alight exit surface 14. In the lateral planarlight emitting module 1 of the present invention provides an important design is required for guiding the light source of thelight emitting diodes 12 while considering the light distribution with a uniform light intensity, such that each of thelight emitting diodes 12 has its own light distribution area with a different intensity to corresponding different optical paths. - In
FIGS. 1A and 1B , the indexes of refraction of thelight emitting diodes 12 and anenvironmental medium 2 are different, so that the radiation field of thelight emitting diodes 12 has a pattern of an anisotropic distribution. From the figures, each of thelight emitting diodes 12 is comprised of asemiconductor structure 1202 having adot light source 1201. Assumed that thesemiconductor structure 1202 is ns, the environmental medium index of refraction is Ile, and the interface distance from thedot light source 1201 to thesemiconductor structure 1202 and theenvironmental medium 2 is very short (as shown inFIG. 1B ), a normal included angle between the light source path of thelight emitting diodes 12 and theenvironmental medium 2 is equal to φ, and the angle of refraction after the light is refracted from the interface is equal to θ. According to the Snell's law and the condition of φ being very small (or sin θ≈φ), ns φ=ne sin θ. According to the law of conservation of energy, the radiation powers at both sides of the interface are substantially equal, or IsdAs=IedAe, wherein Is is the internal light intensity (W/m2) of thesemiconductor structure 1202, Ie is the light intensity (W/m2) of theenvironmental medium 2, dAs and dAe are areas per unit of thesemiconductor structure 1202 and theenvironmental medium 2. If the radiation field of each of thelight emitting diodes 12 is axially symmetrical, dAe=2πR sin θRdθ, and dAs=2πR sin φ Rd θ≈2πR2 φ d φ, so that theenvironmental medium 2 with a distance of R from thedot light source 1201 has a light intensity Ie=(P/4πR2)(ne 2/ns 2)cos θ. Obviously, the light intensity distribution relates to cos θ, wherein the maximum intensity occurs when θ=0°, and the light intensity is equal to half of the maximum intensity when θ=60°. InFIG. 1C , a stronglight emitting area 121, a secondarylight emitting area 122, a weaklight emitting area 123, and a slightlylight emitting area 124 are formed sequentially in the light intensity distribution area of each of thelight emitting diodes 12 and at a normal included angle between each of thelight emitting diodes 12 and anenvironmental medium 2 ranging from 0° to 90°. Preferably, if the normal included angle between any one optical path in the stronglight emitting area 121 and theenvironmental medium 2 is equal to θ1, the normal included angle between any one optical path in the secondarylight emitting area 122 and theenvironmental medium 2 is equal to θ2, the normal included angle between any one optical path in the weaklight emitting area 123 and theenvironmental medium 2 is equal to θ3 and the normal included angle between any one optical path in the slightlylight emitting area 124 and theenvironmental medium 2 is equal to θ4, then θ1 falls within a range of 0°<θ1≦30°, θ2 falls within a range of 30°<θ2≦45°, θ3 falls within a range of 45°<θ3≦60° and θ4 falls within a range of 60°<θ4≦90°. From the description above, the maximum light intensity occurs at a normal included angle between each of thelight emitting diodes 12 and anenvironmental medium 2 equal to 0°; (√{square root over ( )}3)/2 of the maximum light intensity occurs at the included angle of 30°; (√{square root over ( )}2)/2 of the maximum light intensity occurs at the included angle of 45°; ½ of the maximum light intensity occurs at the normal included angle of 60° ½; and the intensity approaches zero at the normal included angle of 90°. - With the direct proportion between the light intensity at a certain position of the
light emitting diodes 12 and the projection angle, and the inverse proportion between the light intensity at a certain position of thelight emitting diodes 12 and the square of distance, a light emitting effect with almost the same light intensity distribution can be achieved in different intensity areas of a singlelight emitting diode 12 by means of the light reflection from thereflective micro-structure 101 or the direct light projection on thelight exit surface 14. For example, a first light output point p1 emitted from the strong light emitting area onto the light exit surface, a second light output point p2 emitted from the secondary light emitting area onto the light exit surface, a third light output point p3 emitted from the weak light emitting area onto the light exit surface, and a fourth light output point p4 emitted from the slightly light emitting area onto the light exit surface have the same distance Rp1, Rp2Rp3 and Rp4 from thelight emitting diode 12 of the same two-dimensional space, then Rp1>R2>Rp3>Rp4. - In the designs of different sizes, if the distance between the
rectangular base plate 10 and thelight exit surface 14 falls within a range of 0.1 cm˜5 cm, the relation cos θ1/R1 2≈cos θ2/R2 2≈cos θ3/R3 2≈cos θ4/R4 2 is adjusted to obtain the best light emitting effect. It is noteworthy to point out that thelight emitting diodes 12 as shown inFIG. 2B can be installed on two opposite long sides of therectangular base plate 10 respectively, and the structural design of thereflective micro-structures 101 can be designed as larger or smaller orderly arranged protruding structures according to the distance from thelight emitting diodes 12. Such design is intended for reflecting the light source of thelight emitting diodes 12 with different angles from thereflective micro-structure 101, such that the reflection from an area with a stronger intensity of the light source will not increase the optical path too much, and the area with a weaker intensity of the light source can maintain substantially the same output light intensity at thelight exit surface 14. InFIG. 3 , thereflective micro-structure 101 includes two primaryinclined plate structures 1011, and the two primaryinclined plate structures 1011 are light emittingdiodes 12 disposed opposite to both sides of therectangular base plate 10 respectively and installed at the middle positions of therectangular base plate 10. In the figure, the height and inclination for installing the two primaryinclined plate structures 1011 is determined by the distance from thelight emitting diodes 12 and the aforementioned relation. Preferably, the two primaryinclined plate structures 1011 are light emittingdiodes 12 arranged in an array on one of the corresponding sides only. Therefore, the light source path can be controlled at the reflection position of thelight exit surface 14 effectively. Since the distances from therectangular base plate 10 and thelight exit surface 14 are different, the height and inclination of the two primaryinclined plate structures 1011 will be determined by adjusting the relation of cos θ1/R1 2≈cos θ2/R2 2≈cos θ3/R3 2≈cos θ4/R4 2. with reference toFIG. 4 for a second cross-sectional view of a lateral planar light emitting module in accordance with the present invention, the optical path of each of thelight emitting diodes 12 can be adjusted flexibly at the position of thelight exit surface 14, and adjacent sides of the two primaryinclined plate structures 1011 have two secondaryinclined plate structures 1012 respectively for fixing each light emitting area with a fixed output light angle on thelight exit surface 14 to form different optical paths, so as to adjust the magnitude and position of the light intensity of the output light. It is noteworthy to point out that the two primaryinclined plate structures 1011 and the two secondaryinclined plate structures 1012 can be designed with a non-flat plate surface for changing the angle of the optical path significantly and effectively without increasing the optical path too much, so as to maintain the performance of the light intensity. - With reference to
FIG. 5 for a cross-sectional view of a lateral planar light emitting module with an optical lens in accordance with the present invention, the structural design of the foregoing preferred embodiment adjusts the light intensity of the output light when the output position and the length of the optical length in the light emitting area of thelight emitting diodes 12 are fixed through thereflective micro-structure 101. In this preferred embodiment, anoptical lens 16 is provided for changing the range of the light emitting area of thelight emitting diodes 12 directly, and two adjustment factors are used for adjusting the position and the intensity of the output light at thelight exit surface 14. In the figure, if the present invention is applied in a flat plate illumination, the central position of thelight exit surface 14 is emphasized, so that theoptical lens 16 can reflect all lights projected onto thereflective micro-structure 101 for the areas with the light intensity grater than half of the maximum intensity, so that a larger range of the light intensity can be used effectively. - With reference to
FIG. 6 for a cross-sectional view of a light emitting diode of a lateral planar light emitting module projecting lights at different angles towards a rectangular base plate in accordance with the present invention, thelight emitting diodes 12 of the present invention are arranged in an array, so that the radiation field of each of thelight emitting diodes 12 at thelight exit surface 14 may have a superimposition effect. Therefore, the edges (such as the frame of the display) of therectangular base plate 10 have a less superimposition effect than the central area of therectangular base plate 10. To adjust the uniformity of the light intensity at the edges of therectangular base plate 10 and other positions of thelight exit surface 14, thelight emitting diodes 12 can be installed at a different angle with respect to therectangular base plate 10, such that the light emitting areas of thelight emitting diodes 12 can be used effectively. - In summation of the description of the foregoing preferred embodiments, the effects of the present invention reside on that the lateral planar light emitting module having the rectangular base plate and the plurality of light emitting diodes is provided, and the rectangular base plate has a diagonal falling within a range of 5˜100 cm, and the light emitting diodes are designed with an array arrangement and installed on both opposite sides of the rectangular base plate respectively, such that a light source emitted from the light emitting diodes can be directly projected, or reflected from a reflective micro=structure of the rectangular base plate, and then a light emitting effect with a uniform light intensity is achieved on a light exit surface, wherein the light exit surface opposite to a light projection area with a different intensity produced by the same light emitting diode has an optical path with a different distance and used for substituting a light guide plate used in a conventional backlight module or planar light emitting source to enhance the brightness of an optical film structure, lower the manufacturing cost, and improve the light emitting efficiency effectively.
Claims (18)
1. A lateral planar light emitting module, comprising a rectangular base plate and a plurality of light emitting diodes, and the rectangular base plate having a diagonal falling within a range of 5˜100 cm, and light emitting diodes being designed with an array arrangement and installed on both opposite sides of the rectangular base plate respectively, so that a light source emitted from the light emitting diodes is projected directly or reflected from the rectangular base plate, and then light emitting effect with a uniform light intensity distribution at a light exit surface is achieved, and the lateral planar light emitting module is characterized in that a strong light emitting area, a secondary light emitting area, a weak light emitting area and a slightly light emitting area are formed sequentially at normal included angles between each of the light emitting diodes and an environmental medium from 0° to 90°, and the rectangular base plate includes at least one reflective micro-structure formed thereon, and when the light source emitted from each of the light emitting diodes has not passed through a reflection path or reflected from the rectangular base plate of the reflective micro-structure, a first light output point p1 emitted from the strong light emitting area onto the light exit surface, a second light output point p2 emitted from the secondary light emitting area onto the light exit surface, a third light output point p3 emitted from the weak light emitting area onto the light exit surface, and a fourth light output point p4 emitted from the slightly light emitting area onto the light exit surface have a distance of Rp1, Rp2, Rp3 and Rp4 from the light emitting diode of the same two-dimensional space respectively, and Rp1>Rp2>Rp3>Rp4.
2. The lateral planar light emitting module of claim 1 , wherein when the normal included angle between any one optical path in the strong light emitting area and the environmental medium is equal to θ1, the normal included angle between any one optical path in the secondary light emitting area and the environmental medium is equal to θ2, the normal included angle between any one optical path in the weak light emitting area is equal to θ3 and the normal included angle between any one optical path in the slightly light emitting area is equal to θ4, then cos θ1/R1 2≈cos θ2/R2 2≈cos θ3/R3 2≈cos θ4/R4 2.
3. The lateral planar light emitting module of claim 2 , wherein the angle θ1 falls within a range of 0°<θ1≦30°, the angle θ2 falls within a range of 30°<θ2≦45°, the angle θ3 falls within a range of 45°<θ3≦60° and the angle θ4 falls within a range of 60°<θ4≦90°.
4. The lateral planar light emitting module of claim 3 , wherein the rectangular base plate and the light exit surface have a distance falling within a range of 0.1 cm˜5 cm apart from each other.
5. The lateral planar light emitting module of claim 2 , wherein the reflective micro-structure includes two primary inclined plate structures, and the light emitting diodes disposed opposite to both sides of the rectangular base plate are installed at the middle positions of the rectangular base plate.
6. The lateral planar light emitting module of claim 5 , wherein the reflective micro-structure further includes two secondary inclined plate structures coupled to a side of the two primary inclined plate structures respectively.
7. The lateral planar light emitting module of claim 1 , further comprising at least one optical lens installed at a light output position of the light emitting diode.
8. The lateral planar light emitting module of claim 2 , further comprising at least one optical lens installed at a light output position of the light emitting diode.
9. The lateral planar light emitting module of claim 3 , further comprising at least one optical lens installed at a light output position of the light emitting diode.
10. The lateral planar light emitting module of claim 4 , further comprising at least one optical lens installed at a light output position of the light emitting diode.
11. The lateral planar light emitting module of claim 5 , further comprising at least one optical lens installed at a light output position of the light emitting diode.
12. The lateral planar light emitting module of claim 6 , further comprising at least one optical lens installed at a light output position of the light emitting diode.
13. The lateral planar light emitting module of claim 1 , wherein the light emitting diodes are installed at different angles towards the rectangular base plate.
14. The lateral planar light emitting module of claim 2 , wherein the light emitting diodes are installed at different angles towards the rectangular base plate.
15. The lateral planar light emitting module of claim 3 , wherein the light emitting diodes are installed at different angles towards the rectangular base plate.
16. The lateral planar light emitting module of claim 4 , wherein the light emitting diodes are installed at different angles towards the rectangular base plate.
17. The lateral planar light emitting module of claim 5 , wherein the light emitting diodes are installed at different angles towards the rectangular base plate.
18. The lateral planar light emitting module of claim 6 , wherein the light emitting diodes are installed at different angles towards the rectangular base plate.
Priority Applications (1)
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US14/578,507 US20150103530A1 (en) | 2011-12-27 | 2014-12-22 | Lateral Planar Light Emitting Module |
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TW100148865 | 2011-12-27 | ||
TW100148865A TWI444569B (en) | 2011-12-27 | 2011-12-27 | Side entry type light emitting module |
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US14/578,507 Continuation US20150103530A1 (en) | 2011-12-27 | 2014-12-22 | Lateral Planar Light Emitting Module |
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US20130163284A1 true US20130163284A1 (en) | 2013-06-27 |
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US14/578,507 Abandoned US20150103530A1 (en) | 2011-12-27 | 2014-12-22 | Lateral Planar Light Emitting Module |
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US14/578,507 Abandoned US20150103530A1 (en) | 2011-12-27 | 2014-12-22 | Lateral Planar Light Emitting Module |
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US (2) | US20130163284A1 (en) |
JP (2) | JP2013137988A (en) |
KR (1) | KR101411218B1 (en) |
CN (1) | CN103185237B (en) |
DE (1) | DE102012104245B4 (en) |
ES (1) | ES2441916B1 (en) |
FR (1) | FR2984994B1 (en) |
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CN116913181A (en) * | 2023-09-06 | 2023-10-20 | 山西麦信易科技有限公司 | Micro-assembly LED display and assembly method |
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KR101592676B1 (en) * | 2014-03-20 | 2016-02-12 | 현대자동차주식회사 | Planar Lighting Mirror with Nano-patterns |
CN104110597B (en) * | 2014-06-17 | 2017-04-19 | 新丰电器(中山)有限公司 | LED panel light |
CN108534033A (en) * | 2018-05-31 | 2018-09-14 | 易美芯光(北京)科技有限公司 | A kind of ultra-thin LED panel lamp |
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Also Published As
Publication number | Publication date |
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CN103185237A (en) | 2013-07-03 |
FR2984994B1 (en) | 2018-11-02 |
US20150103530A1 (en) | 2015-04-16 |
DE102012104245B4 (en) | 2016-06-02 |
JP3196465U (en) | 2015-03-12 |
ES2441916B1 (en) | 2014-08-22 |
CN103185237B (en) | 2015-04-22 |
KR20130075652A (en) | 2013-07-05 |
ES2441916R1 (en) | 2014-02-19 |
FR2984994A1 (en) | 2013-06-28 |
KR101411218B1 (en) | 2014-06-23 |
DE102012104245A1 (en) | 2013-06-27 |
TW201326673A (en) | 2013-07-01 |
ES2441916A2 (en) | 2014-02-06 |
TWI444569B (en) | 2014-07-11 |
JP2013137988A (en) | 2013-07-11 |
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